The chart below shows the total number of minutes in billions of telephone calls in the UK divided into three categories from 1995 2002

Given column graph illustrates the time that people spend for calling among three different types in UK between 1995 and 2002
Overall, most of types rose rapidly over the period while the local fluctuated gradually. The local is the highest time calling in all categories.
In 1995, the local started at lowest point at 70 billion minutes. In the 4 next years, the local increased steadily from 73 billion minutes to 90 billion minutes. From 1999 to 2002, the total number of minutes of the local fell gradually approximately 17 billions back to 73 billions.
At the same period time, two others grown constantly. From 1995 to 1998, the mobiles increased slightly about 5 billions. Between 1998 and 2002, it rose exponentially approximately 5 folds from 8 billions in 1998 to 40 billions in 2002. Over 7 years beginning at 1995, the national and international call grown gradually about 2 billions. In 2002, it hit the highest point at 60 billions